Water-tube boiler.



N0. 635,7l0. Patented Oct. 24, I899. P. n. BLACKDEN.

WATER TUBE BOILER.

' (Application filed May 29. 1899.)

2 Sheets-Shem (No Model.)

Fig.1.

Inveniom fir yfilimkiiem L59 V (0 Mi uesSes Oo/fl-ZX 7(Wx N0. 635,7l0. Patented Oct. 24, 1899. P. D. BLACKDEN.

WATER TUBE BOILER.

(Application filed May 29. 1899.)

2 Sheets-Sheet 2.

(No Model.)

Inventor l fa ry Witnesses rm: NORRIS PETERS co. FHOTD-LI'IHOWASHINGTON. 0 c,

NiTED ATENT Fries.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent N 0. 635,710, dated October 24, 1899.

Application filed May 29, 1899.

To all whom it may concern:

Be it known that I, PERRY D. BLACKDEN, of Everett, county of Middlesex, State of Massachusetts, have invented an Improvement in Water-Tube Boilers, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention has for its object the production of a very efficient, strong, and simple water-tube boiler having a very large heating-surface relative to its size, whereby steam may be Very quickly generated and readily maintained athigh pressure. Means are also provided for superheating the steam.

Owing to its economy of space, safety, rapidity of steaming, and simplicity of construction the boiler embodying my invention is particularly adapted for use in connection with motor-vehicles, yachts, &c., although its use is in no manner restricted thereto.

Figure 1 is a vertical sectional view of a water-tube boiler, illustrating one e'mbodiment of my invention. Fig. 2 is atransverse sectional view on the line 2 2, Fig. 1, looking down; and Fig. 3 is an enlarged sectional detail to be described.

The main portion of the boiler is inclosed in a suitable metallic shell A, herein shown as rectangular in shape and braced at the vertical and upper corners by suitable an gleirons a, riveted thereto. Within this shell I mount the boiler proper, itcomprising a steam chamber or dome B, water-chamber G, and water circulatory tubes D, connected with the inner heads I) and c of said chambers, the ends of the tubes being expanded at d in holes in the heads by means of any suitable tube-expander. The heads I) and b of the steam-chamber are connected by a suitablyshaped and flanged ring b which forms the side walls of the chamber, a steam-pipe 1) leading from the chamber through the shell A to the throttle, (not shown,) and the heads, while equidistant from each other at all points, are preferably dished, as shown in Fig. 1.

Inner and outer forged rings and 0 are riveted between the heads 0 and c of the water-chamber O to form a ring-like or annular 5 0 chamber with a central opening 0, the heads being also slightly dished, as shown in Fig. 1. As the dishing of the heads of the two Serial No. 718,690. (No model.)

chambers is made the same, the two parts of each at one side of the median line will be in parallelism.

The water chamber is preferably made rather shallow in order to present a rather thin body of water to the action of the heating medium, the water-chamber, as herein shown, forming the top of the combustionchamber A of the shell, which I have shown herein as provided with any suitable burners M for a hydrocarbon fuel, though my invention is not'restricted thereto.

The water-chamberis supported in the shell in any suitable manner, as by making notches a in the angle-irons to receive the edges of the chamber.

By providing a central opening in the Water-chamber the heated products from the combustion chamber pass freely into the space between the water and steam chambers, circulating around and heating the watertubes D exteriorly and finally passing from the sh ell through an opening A intoa flue A Referring to Fig. 2, the opening 0 is shown as elongated and the water-tubes are arranged in two sections, one at each side thereof, at right angles to the heads I) and 0, but inclined toward each other, owing to the dishing of the heads, the tubes serving also to brace the heads without other devices. Heating-fines H are extended through the water-tubes and the water and steam chambers and are rigidly secured to the outer heads I) and def the latter by means of screw-plugs h, screwed tightly into holes in the outer heads, the ends of the tines being expanded, as at h Fig 3, in

the plugs. The plugs are provided with polygonal heads 71 by which they are screwed into place or removed, the holes for the plugs being made large enough to admit an expanding deviceto operate on the opposite watertube. By this construction repairs can be readily made, such as the removal of a damaged water-tube and the substitution of a new I one, without requiring the removal of a section of tubing, as it is only necessary to remove the correspondingheating-fines H. The latter convey the heat from the combustionchamber to the interior of the column-like bodies of water passing through the watertubes, thus greatly increasing the effective heating-surface of the boiler. Any portion IOO level in the steam-chamber B will act to superheat the contents of said chamber. The fines serve also as braces for the outer heads I) and c of the chambers 13 and C, obviating the use of additional tie-rods and braces and making a very strong, rigid, yet light construction.

In Fig. 1 the arrows show the passage of the heated products from the combustion chamber.

Steam is rapidly made and readily maintained at the required degree of pressure, the heating-surface is very great relative to the size of the boiler, and the construction described reduces the danger from an explosion to a minimum.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a water-tube boiler, a shallow waterchamber composed of upper and lower heads dished and in parallelism at each side of the central opening of the chamber, and inner and outer rings connecting them, to form a central, elongated opening, asteam-chamber composed of top and bottom heads dished, and a ring connecting them and forming the side walls of the chamber, said chamber being of greater depth than the waterchamber, and connections between said chambers to effect circulation of the water in hollow columnar form, heated on their inner and outer surfaces.

2. A water-tube boiler, comprising a shallow, annular water-chamber, a steam-chamber having a greater depth than the waterchamber, water-tubes connecting said chambers, and heating-fines passing through the said tubes and chambers and secured to the outer heads of the latter, the heads of the chambers being dished and in parallelism at each side of the central opening of the waterchamber.

3. In a water-tube boiler, an inclosing shell having a combustion-chamber in its lower portion, a shallow, rectangular water-chamber therein having an elongated central opening, a rectangular steam-chamber in the up per part of the shell and of greater depth than the water-chamber, water circulatory tubes connecting said water and steam chambers, and heating-fines extended from the outer head of one to the outer head of the other of said chambers through the water-tubes, the said flues serving also to superheat the contents of the steam-chamber, the tubes and fines being arranged in two groups separated at their lower ends and located at opposite sides of the central opening of the waterchamber.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PERRY D. BLAOKDEN.

Witnesses:

JOHN C. EDWARDS, AUGUSTA E. DEAN. 

